Hi Elisa, welcome to planDisney!
You can certainly change your current
theme park reservations. I'd be more than happy to walk you through the process! First and foremost, please know that to change your current reservation, you must first CANCEL your current reservation. To do this, you will need to log in to your
Disneyland Resort account, select the "My Disneyland" link, and then click the "Ticket and Reservation Details" link. Select the reservation you wish to cancel and click "Cancel Reservation". Once canceled, you're free to go ahead and book your new reservation! I also recommend viewing the
Theme Park Reservation Availability Calendar to see if there is availability on the day and theme park that you wish to visit.
And before I let you go, I have a bit of news to share! The
Main Street Electrical Parade and
Disneyland Forever fireworks will be sadly ending their limited-time runs on September 1, 2022. If you are able, I highly recommend visiting the Disneyland Resort to catch these great nighttime experiences one last time before they fly away.
See ya real soon!
Jin